GroupDocs.Metadata allows you to load password-protected documents and load files from different sources.
For more details please refer to the following guides:...Annotation Product Solution GroupDocs...
This section explains how to search for electronic signatures across document and its pages with advanced options....Annotation Product Solution GroupDocs...
Saving a document with method Save(), GroupDocs.Watermark puts it in the same folder as the original file, rewriting original. If you need to save the document to any custom location, you’ll have to use Save(string) method or Save(Stream) of Watermarker class.
You can see examples of Save methods in one of these guides:
Save document to the same file or stream Save document to the specified location Save document to the specified stream...Annotation Product Solution GroupDocs...
Following this guide you will learn how to load PDF, Word, Excel, PowerPoint documents by local file path, stream or URL for further processing with GroupDocs.Merger for Java API....Annotation Product Solution GroupDocs...